/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.engineconnplugin.flink.client.sql.operation.result;

import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.annotation.JsonSerialize;
import org.apache.flink.types.Row;
import org.apache.flink.util.Preconditions;

import javax.annotation.Nullable;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

/**
 * A set of one statement execution result containing result kind, column infos, rows of data and
 * change flags for streaming mode.
 */
@JsonSerialize(using = ResultSetJsonSerializer.class)
@JsonDeserialize(using = ResultSetJsonDeserializer.class)
public class ResultSet {
    static final String FIELD_NAME_RESULT_KIND = "result_kind";
    static final String FIELD_NAME_COLUMNS = "columns";
    static final String FIELD_NAME_DATA = "data";
    static final String FIELD_NAME_CHANGE_FLAGS = "change_flags";

    private final ResultKind resultKind;
    private final List<ColumnInfo> columns;
    private final List<Row> data;

    // null in batch mode
    //
    // list of boolean in streaming mode,
    // true if the corresponding row is an append row, false if its a retract row
    private final List<Boolean> changeFlags;

    private ResultSet(
            ResultKind resultKind,
            List<ColumnInfo> columns,
            List<Row> data,
            @Nullable List<Boolean> changeFlags) {
        this.resultKind = Preconditions.checkNotNull(resultKind, "resultKind must not be null");
        this.columns = Preconditions.checkNotNull(columns, "columns must not be null");
        this.data = Preconditions.checkNotNull(data, "data must not be null");
        if (!data.isEmpty()) {
            Preconditions.checkArgument(
                    columns.size() == data.get(0).getArity(),
                    "the size of columns and the number of fields in the row should be equal");
        }
        this.changeFlags = changeFlags;
        if (changeFlags != null) {
            Preconditions.checkArgument(
                    data.size() == changeFlags.size(),
                    "the size of data and the size of changeFlags should be equal");
        }
    }

    public ResultKind getResultKind() {
        return resultKind;
    }

    public List<ColumnInfo> getColumns() {
        return columns;
    }

    public List<Row> getData() {
        return data;
    }

    public Optional<List<Boolean>> getChangeFlags() {
        return Optional.ofNullable(changeFlags);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ResultSet resultSet = (ResultSet) o;
        return resultKind.equals(resultSet.resultKind)
                && columns.equals(resultSet.columns)
                && data.equals(resultSet.data)
                && Objects.equals(changeFlags, resultSet.changeFlags);
    }

    @Override
    public int hashCode() {
        return Objects.hash(resultKind, columns, data, changeFlags);
    }

    @Override
    public String toString() {
        return "ResultSet{"
                + "resultKind="
                + resultKind
                + ", columns="
                + columns
                + ", data="
                + data
                + ", changeFlags="
                + changeFlags
                + '}';
    }

    public static Builder builder() {
        return new Builder();
    }

    /** Builder for {@link ResultSet}. */
    public static class Builder {
        private ResultKind resultKind = null;
        private List<ColumnInfo> columns = null;
        private List<Row> data = null;
        private List<Boolean> changeFlags = null;

        private Builder() {}

        /** Set {@link ResultKind}. */
        public Builder resultKind(ResultKind resultKind) {
            this.resultKind = resultKind;
            return this;
        }

        /** Set {@link ColumnInfo}s. */
        public Builder columns(ColumnInfo... columns) {
            this.columns = Arrays.asList(columns);
            return this;
        }

        /** Set {@link ColumnInfo}s. */
        public Builder columns(List<ColumnInfo> columns) {
            this.columns = columns;
            return this;
        }

        /** Set data. */
        public Builder data(List<Row> data) {
            this.data = data;
            return this;
        }

        /** Set data. */
        public Builder data(Row... data) {
            this.data = Arrays.asList(data);
            return this;
        }

        /** Set change flags. */
        public Builder changeFlags(List<Boolean> changeFlags) {
            this.changeFlags = changeFlags;
            return this;
        }

        /** Returns a {@link ResultSet} instance. */
        public ResultSet build() {
            return new ResultSet(resultKind, columns, data, changeFlags);
        }
    }
}
